putting that in here as well, problem has been discussed in this thread already
>> https://answers.ea.com/t5/Technical-Issues-PC/Error-Code-131-ec627cc9/m-p/6499024/highlight/true#M104876
Product: The Sims 4
Platform: PC
Which language are you playing the game in? English
How often does the bug occur? reproducable; appears when conditions are met
What expansions, game packs, and stuff packs do you have installed? everything
Steps: How can we find the bug ourselves? have a pet run away, leave the household and play another one for a few sim days
What happens when the bug occurs? pet runs away. after playing a bit with another household and returning to the missing-pet household, error code 131:6ec27cc9:963f8eb8 pops up. with the second try, the household successfully loads, but the pet is still shown as missing in the UI although the "greet them back" message popped up and they are running around on the lot
What do you expect to see? pet being back completely
Have you installed any customization with the game, e.g. Custom Content or Mods? Yup
Did this issue appear after a specific patch or change you made to your system? 1.36 (pets, obviously), can't say which one specific